> That sub-US$10 CMOS CAMERA MODULEs may fit the space. The moving
> mirror would reflect the laser beam at different pixels depending on
> the mirror position. The microcontroller does not need to be powerful
> in this case. (Waiting for someone posting that the above idea is old,
> well known, trivial etc :-)

Seriously, I believe the idea is well known, any hints (links) on this
type of proximity sensors will be greatly appreciated.
--=20
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